JP3179743U - Lid mounting structure - Google Patents

Abstract

Provided is a lid mounting structure such as a drainage basin that can suppress an increase in internal pressure as a simple configuration, can be easily mounted, and prevents inadvertent detachment after mounting.
A mounting structure of a substantially disc-shaped lid 40 to be mounted on a drain 10 or an opening 23 of a manhole. The lid is provided with a support surface 42 supported on the receiving surface 29 of the locking protrusion 25 provided on the inner peripheral side of the opening on the outer peripheral edge of the lid body 41, and prevents the lid from coming off upward. Two locking claws 45 that lock the lower surface 30 of the locking ridge portion are provided so as to be able to be regulated. The two locking claws 45 are arranged so that the mutual separation angle with respect to the center CC of the lid is less than 180 °, and when the pressing force acts on the lid after mounting, The outer peripheral edge 42a away from the two engaging claws in the lid is detached upward from the receiving surface 29 while the lid is tilted while maintaining the locking of the lid and restricting the detachment from the opening of the lid. Arranged.
[Selection] Figure 8

Description

  The present invention relates to a mounting structure for a substantially disc-shaped lid that is attached to an opening of a manhole or drainage for rainwater, sewage, miscellaneous drainage, or the like.

  Conventionally, in the mounting structure of the lid attached to the opening of the drain for this kind of drainage, a locking projection is formed on the inner peripheral side of the upper end of the substantially cylindrical tube portion that rises upward such as a bayonet connection. The part was intermittently formed in the circumferential direction. Also, on the lid side, a cylindrical tube part that is inserted into the opening protrudes from the lower surface of the disc-shaped lid body, and can be inserted between the locking projections on the outer peripheral surface of the tube part And the latching claw part which can rotate the lid | cover after insertion and can latch the lower surface of a latching convex part was formed (for example, refer patent document 1).

  In such a lid mounting structure, when the lid is inserted into the opening of the substantially cylindrical tube portion and rotated, the latching claw portion is latched to the latching convex portion, and the lid is locked. , Could be installed in the opening.

Japanese Utility Model Publication No. 63-23498

  However, with the conventional mounting structure, as shown in FIG. 12, when there is a large amount of rainfall such as guerrilla heavy rain R, the water level in the drainage basin 60 rises due to reverse flow from the sewage main side. In this case, if the lid 61 is locked, the internal pressure in the drainage drain 60 rises due to the sealed state by the lid 61, causing a situation where the trap seal water of various indoor devices is blown up. I will let you.

  By the way, without taking this point into consideration, even if a lid is attached so as to be fitted into the opening using a sealing material without providing a locking mechanism, as shown in FIG. 13, guerrilla heavy rain R For example, if rainwater W accumulates around the drainage basin 70, the lid 71 is removed, and if the lid 71 is made of a lightweight synthetic resin, the drainage basin 70 is drained by the rainwater W. There is no state of 71, and the leg of the pedestrian may fit into the drainage 70, which may cause the pedestrian to fall.

  The present invention solves the above-mentioned problems, and has a lid mounting structure that can suppress an increase in internal pressure and can be easily mounted as well as prevent inadvertent detachment after mounting as a simple configuration. The purpose is to provide.

<Explanation of Claim 1>
The lid mounting structure according to the present invention is a substantially disk-shaped lid mounting structure that is attached to the drainage or manhole opening,
The opening is disposed on the inner peripheral side of the upper end of the substantially cylindrical vertical tube portion,
A locking ridge that protrudes inward by providing a recess on the inner periphery of the upper end of the vertical tube portion that can receive the lower surface of the outer peripheral edge of the lid, and a recess that can accommodate the lid above the receiving surface. Part is disposed over substantially the entire circumference,
The lid has a support surface supported by the receiving surface of the locking ridge on the lower surface of the outer peripheral edge of the lid body, and the lower surface of the locking ridge can be controlled to prevent the lid from coming off upward. The two locking claws that lock the are arranged on the lower surface near the outer periphery of the lid body,
Each of the two locking claws includes a shaft portion extending downward from the lid body, and a flange portion that bends from the lower end of the shaft portion and extends outward so that the lower surface of the locking protrusion can be locked. In addition,
When attaching to the opening of the lid, the lid is lowered from the position shifted from the center of the opening, along the opening surface of the opening, while being shifted and moved, and the hooks of the two locking claws Is positioned below the locking ridge through the inner peripheral side of the locking ridge, and further, the locking position below the lower surface of the locking ridge that can lock the locking ridge. Can be placed and installed in the opening,
Two locking claws
The mutual separation angle with respect to the center of the lid is arranged as an angle of less than 180 °, and
When the pressing force is applied to the upper side of the lid after mounting, the locking ridges are kept locked to prevent the lid from coming off from the opening. The outer peripheral edge away from the pawl is disposed so as to be separated upward from the receiving surface.

In the lid mounting structure according to the present invention, the lid is moved downward from the position displaced from the center of the opening while being displaced laterally substantially along the opening surface of the opening, and the two locking claws The hook portion is positioned below the locking ridge portion via the inner peripheral side of the locking ridge portion, and further below the lower surface of the locking ridge portion capable of locking the locking ridge portion. If it arrange | positions in a latching position, a lid | cover can be mounted | worn so that an opening part may be plugged up. That is, the lid body is simply tilted, shifted, and lowered so that the outer peripheral edges of the two locking claw-side lid bodies are partially inserted into the opening side. In addition, after the lid is attached, even if the pressure in the vertical pipe increases due to backflow from the sewage main due to guerrilla heavy rain etc. The part abuts the lower surface of the locking ridge part, and the outer peripheral edge of the lid body on the side far from the locking claw is partially lifted from the receiving surface of the locking ridge part with the contact part as a fulcrum. The lid is tilted so that it can be separated from the outside, and air and rainwater inside can be released to the outside from between the outer periphery of the lid body and the receiving surface, and pressure is applied to the indoor drain pipe side. Since it can be prevented from being hung, the drain trap can be prevented from being broken.

  At this time, even if the lid is inclined, the hook portion of the two locking claws locks the lower surface of the locking protrusion, so that the lid itself does not come off from the opening, When the increase in internal pressure is subsided, the lid descends and the lower surface of the outer peripheral edge of the lid main body is brought into contact with the receiving surface of the locking protrusion, so that the closed state of the opening by the lid can be maintained.

  In addition, simply lifting the lid upwards keeps the hooks of the two locking claws locking the lower surface of the locking ridge, so that they cannot be removed easily and inadvertently removed. This prevents the lid from being stolen.

  Of course, the removal of the lid from the opening can be performed by reversing the opening along the opening surface of the opening while lifting the outer peripheral edge of the lid body away from the two locking claws. The pawl is detached from the locking position, is disposed on the inner peripheral side of the locking ridge, and is further removed from the opening so that the lid can be easily removed.

  The above-described action can be achieved simply by disposing the two locking claws in the vicinity of the outer peripheral edge of the lid, with the mutual separation angle being less than 180 °, and can be configured extremely simply. .

<Explanation of Claim 2>
In the lid mounting structure according to the present invention, it is desirable that the two locking claws are arranged with the mutual separation angle with respect to the center of the lid being in the range of 90 to 140 °.

  In such a configuration, the lid can be easily attached and removed to prevent unnecessary disconnection when the internal pressure of the vertical tube rises, ensuring a stable locking state of the locking protrusion, The lid can be tilted and opened so that air and rainwater can flow out.

  That is, when approaching 180 ° so that the distance between the two locking claws exceeds 140 °, the two locking claws are shifted along the opening surface of the opening when the lid is attached to engage the locking claws. When it is arranged below the locking ridge through the inner peripheral side of the locking ridge, the protruding amount of the flange from the shaft portion is not small (in other words, the locking claw at the locking nail If the locking allowance for locking the ridge portion is not small), it becomes impossible to arrange, and therefore, the locking allowance for locking the locking ridge portion in the hook portion of the locking claw is small, and stable, The lid cannot be locked to the locking ridge.

  Also, if the distance between the two locking claws is reduced to less than 90 °, when the outer peripheral edge of the lid body away from the two locking claws is pulled up, it can be pulled up greatly, and the lid can be easily removed. The situation that can be opened is invited.

  That is, when lifting the outer peripheral edge of the lid away from the two locking claws, the portion that contacts the receiving surface of the locking ridge on the lower surface of the outer peripheral edge of the lid on the side close to the two locking claws is tilted. The tilt angle of the lid to be lifted is the angle until the hook portion of the locking claw comes into contact with the lower surface of the locking protrusion and is regulated. At that time, if the gap between the hook portion of the locking claw and the locking ridge when the lid is attached is the same, compared to the case where the separation angle between the two locking claws is 90 ° or more. When the separation angle of the two locking claws is less than 90 °, the distance from the rotation center of the lid inclination to the two locking claws is shortened, and the outer peripheral side of the lid away from the two locking claws is This is because the lid is lifted greatly, the inclination angle of the lid is increased, and there is a possibility that the lid can be removed without shifting in the lateral direction.

<Structure of Claim 3>
In the lid mounting structure according to the present invention, when the two locking claws have a mutual separation angle within the range of 90 to 140 ° with respect to the center of the lid, It is desirable to dispose the lid so that the inclination angle of the lid when the pressing force is applied is within a range of 1 to 15 °.

  This is because if the lid is inclined so as to exceed 15 °, the inclination angle of the lid becomes large, and there is a possibility that the lid can be removed without shifting in the lateral direction.

  Even if the lid can be attached to or removed from the opening while being displaced substantially along the opening surface of the opening, if the allowable inclination angle of the lid is less than 1 °, the vertical tube after mounting This is because when the internal pressure rises in the section, it is not preferable because a sufficient amount of air or rainwater cannot be released and there is a risk of applying pressure to the indoor side.

<Explanation of Claim 4>
In the lid mounting structure according to the present invention, the lid is preferably made of cast iron. If the lid is made of heavy cast iron, even if rainwater accumulates around the vertical pipe, it is made of a lightweight synthetic resin. There is no risk of the lid being accidentally washed away from the lid.

<Explanation of Claim 5>
In the lid mounting structure according to the present invention, it is desirable to project reinforcing ribs on the back surface of the lid body.

  In such a configuration, the bending rigidity of the lid is increased, and even if a heavy object is placed, the lid can be prevented from being broken or bent.

  In the lid mounting structure according to the present invention, as a simple configuration, an increase in internal pressure can be suppressed, it can be easily mounted, and inadvertent removal after mounting can be prevented.

It is a top view of the lid used for one embodiment of the present invention. It is a front view of the lid of an embodiment. It is a bottom view of the lid of an embodiment. It is a partially broken schematic front view which shows the state which mounts the lid | cover of embodiment to a vertical pipe part (mass frame) in order. It is a schematic plan view which shows the state which attaches the lid | cover of embodiment to a vertical pipe part (mass frame) in order. It is a schematic plan view which shows the state which attaches the lid | cover of embodiment to a vertical pipe part (mass frame) in order, and shows the state after FIG. It is a general | schematic fragmentary longitudinal cross-section when the latching claw of the lid | cover of embodiment is arrange | positioned in the latching position of the latching protrusion part. It is a figure explaining the state which the lid | cover of embodiment inclines at the time of the internal pressure rise in a vertical pipe part. It is a figure explaining the use condition of the drainage basin of embodiment. It is a figure which shows the state which a cover inclines and escapes air at the time of the internal pressure rise of the vertical pipe part in embodiment. It is a figure which shows the state which a lid | cover inclines and escapes rainwater at the time of the internal pressure rise of the vertical pipe part in embodiment. It is a figure explaining the use condition of the conventional structure. It is a figure explaining the use condition of the conventional structure. It is a figure explaining the use condition of the conventional structure.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 9, the mounting structure of the embodiment has a drainage pipe 3 extending from a drainage horizontal main pipe 2 and the like disposed on the indoor side of the house 1. It is the attachment structure of the lid | cover 40 with which it attaches to the drainage basin 10 which connected.

  The drainage basin 10 is made of a synthetic resin such as polypropylene or vinyl chloride, and is a cylindrical main body 11 connected to a predetermined sewage main and a cylindrical vertical as an auxiliary (mass frame) connected to the upper part of the main body 11. And a pipe part 20. The main body 11 is provided with a receiving port 12 for connecting a predetermined sewage main pipe or the like.

  In addition, the drainage basin 10 of the embodiment has a small diameter of about 300 to 350φ.

  As shown in FIGS. 5, 7, and 8, the vertical pipe portion 20 is configured by providing a circular opening 23 to which the lid 40 is attached at the upper end 22 of the cylindrical peripheral wall portion 21. On the inner peripheral side of the opening 23, the upper surface is a receiving surface 29 that can receive the lower surface (supporting surface) 42 of the outer peripheral edge of the lid 40, and the concave portion 24 that can accommodate the lid 40 is provided above the receiving surface 29. A locking protrusion 25 that is provided and protrudes inward is disposed over the entire circumference.

  The locking protrusion 25 is provided with a protruding portion 27 protruding upward on the inner peripheral edge so as to provide a groove 26 on the upper surface side, and a packing 28 is provided on the upper surface of the entire circumference of the protruding portion 27. Thus, the receiving surface 29 of the lid 40 is formed.

  As shown in FIGS. 1 to 3, the lid 40 is made of cast iron, and is configured by providing two locking claws 45, 45 on a substantially disc-shaped lid body 41. The lid body 41 has the lower surface of the outer peripheral edge as a support surface 42 that is supported by the receiving surface 29 of the locking protrusion 25.

  Each of the locking claws 45 is bent outward from the lower end of the shaft portion 46 so as to be able to lock the substantially rectangular column-shaped shaft portion 46 extending downward from the lid body 41 and the lower surface 30 of the locking protrusion 25. And a flange portion 47 extending in the direction. And these two latching claws 45 are arrange | positioned as mutual separation angle (theta) S based on the center CC of the lid | cover 40 being less than 180 degrees.

  Then, the separation angle θS, the dimension of the shaft portion 46 and the flange portion 47 of the locking claw 45, that is, the length dimension LV (see FIG. 7) of the shaft portion 46 protruding from the lid body 41, and the flange portion 47. The protrusion length LH protruding from the shaft portion 46 is set so that the lid 40 can be mounted as follows, corresponding to the dimension shape of the locking ridge portion 25.

  That is, when the locking claws 45, 45 are attached to the opening 23 of the lid 40, the lid 40 is moved from the center OC of the opening 23 as shown in FIG. From above the displaced position, it is lowered along the opening surface OP of the opening 23 while being displaced, and as shown in FIGS. 4B and C and FIGS. 6A and 6B, there are two locking claws. 45 ridges 47 are positioned below the locking ridges 25 via the inner peripheral side of the locking ridges 25, and the locking ridges that can further lock the locking ridges 25. It is set at the locking position RP below the lower surface 30 of 25 so that it can be attached to the opening 23.

  Furthermore, these locking claws 45 and 45 maintain the locking of the locking ridge 25 as shown in FIGS. 8 and 10 and 11 when a pressing force acts on the lid 40 after mounting. Then, with the lid 40 being prevented from coming off from the opening 23, the lid 40 is inclined and the separation portion 42 a of the outer peripheral edge of the lid 40 away from the two locking claws 45, 45 is moved upward from the receiving surface 29. It is arrange | positioned so that it may detach from.

  In the case of the embodiment, the separation angle θS with respect to the center CC of the lid 40 of the two locking claws 45, 45 is in the range of 90 to 140 ° that is less than 180 °, and in the embodiment, 120 °. It is said.

  In addition, the tilt angle θC (see FIG. 8) of the lid when the pressing force is applied to the upper side of the lid 40 after mounting is set to be within a range of 1 to 15 °. °.

  A reinforcing rib 50 protruding downward is arranged in a cross shape on the lower surface of the lid body 41. The reinforcing rib 50 has a lower end surface 51, a lower end surface 51 on the center CC side as a flat surface 52, and a lower end surface 51 on the outer peripheral edge side as an inclined surface 53 that continues to the lower surface of the lid body 41. Further, the reinforcing rib 50 is formed so that the two locking claws 45, 45 are arranged at symmetrical positions.

  In addition, on the upper surface side of the lid 40, there are two surroundings at positions just above the reinforcing ribs 50 so that the two locking claws 45, 45 are arranged at symmetrical positions through the center CC of the lid 40. An operation pin 44 is provided with a recess 43 provided on the surface. These operation pins 44 are used to easily move and operate while lifting the lid 40 by hooking a jig such as a predetermined hook when the lid 40 is shifted and attached to or removed from the opening 23. Are disposed.

  In the embodiment, as shown in A of FIG. 4 and A and B of FIG. 5, the lid 40 is substantially aligned with the opening surface OP of the opening 23 from above the position shifted from the center OC of the opening 23. Accordingly, it is lowered while being displaced laterally. Further, as shown in B and C of FIG. 4 and A and B of FIG. 6, the hook 47 of the two hooking claws 45 passes through the inner peripheral side of the hooking protrusion 25, and the hooking protrusion If the lid 40 is disposed at a locking position RP below the lower surface 30 of the locking ridge 25, which is positioned below the locking ridge 25. Can be installed.

That is, in the mounting structure of the embodiment, the lid body 41 is simply so that the adjacent portion 42b of the outer peripheral edge of the lid body 41 on the two locking claws 45, 45 side is partially inserted on the opening 23 side. The lid 40 can be easily attached to the opening 23 simply by tilting, shifting, and lowering. After the lid 40 is attached, as shown in FIGS. Even if the pressure in the vertical pipe portion 20 increases due to the back flow from the main pipe, the lid 40 is lifted, but the state is that the flange portions 47 of the two locking claws 45 are, as shown in FIG. The separation part 42a on the outer peripheral edge of the lid body 41 on the side far from the latching claw 45 is partially partly contacted with the lower surface 30 of the latching protrusion 25 and the contact part (locking position) RP as a fulcrum. The lid is made to be detached upward from the receiving surface 29 of the locking protrusion 25. 40 is inclined so that the internal air A and rainwater W can escape to the outside from between the outer peripheral portion 42 a of the lid body 41 and the receiving surface 29, and the indoor side drainage of the house 1 Since it is possible to prevent pressure from being applied to the pipe 3, the drain trap can be prevented from being broken.

  At this time, even if the lid 40 is inclined, the collar portion 47 of the two latching claws 45 latches the lower surface 30 of the latching ridge portion 25, so that the lid 40 itself is removed from the opening 23. If the increase in the internal pressure in the vertical tube portion 20 is not disengaged, the lid 40 is lowered and the lower surface (support surface) 42 of the outer peripheral edge of the lid body 41 is brought into contact with the receiving surface 29 of the locking protrusion 25. Thus, the closed state of the opening 23 by the lid 40 can be maintained.

  Further, the lid 40 is simply lifted upward so that the flange portions 47 of the two locking claws 45 remain in a state of locking the lower surface 30 of the locking protrusion 25 and cannot be easily detached. Inadvertent removal is prevented, and the lid 40 is less likely to be stolen.

  Of course, removal of the lid 40 from the opening 23 is an operation reverse to that at the time of mounting, and a hook body or the like is hooked on the operation pin 44 (44L) to separate the lid body away from the two locking claws 45. If the separation part 42a of the outer peripheral edge 41 is lifted and shifted along the opening surface OP of the opening 23, the two locking claws 45 are separated from the locking position RP, and the inside of the locking ridge 25 It is arrange | positioned at the circumference side, and also remove | deviates from the opening part 23, and can remove the lid | cover 40 easily.

  The above-described operation can be achieved simply by disposing the two locking claws 45, 45 in the vicinity of the outer peripheral edge of the lid 40 with the mutual separation angle θS being less than 180 °, and extremely easily. Can be configured.

  Therefore, in the attachment structure of the lid 40 of the embodiment, as a simple configuration, an increase in internal pressure can be suppressed, attachment can be easily performed, and inadvertent detachment after attachment can be prevented.

  Further, in the mounting structure of the lid 40 of the embodiment, the two locking claws 45 are arranged with the mutual separation angle θS with respect to the center CC of the lid 40 as 120 ° within the range of 90 to 140 °. ing.

  Therefore, in the embodiment, the attachment and detachment of the lid 40 is made easy to prevent unnecessary detachment when the internal pressure of the vertical tube portion 20 rises, and to secure a stable locking state of the locking protrusion 25. The lid 40 can be tilted and opened so that the internal air A and rainwater W can flow out.

  That is, when approaching 180 ° so that the mutual separation angle θS of the two locking claws 45 exceeds 140 °, the two locking claws 45 are shifted along the opening surface OP of the opening 23 when the lid 40 is attached, When the locking claw 45 is disposed below the locking ridge portion 25 through the inner peripheral side of the locking ridge portion 25, the protruding amount of the flange portion 47 from the shaft portion 46 is not small (in other words, If the locking margin for locking the locking ridge portion 25 in the collar portion 47 of the locking claw 45 is not small), it cannot be arranged, and therefore the locking ridge portion 25 in the flange portion 47 of the locking claw 45 is not provided. The locking allowance for locking is reduced, and the lid 40 cannot be locked to the locking protrusion 25 stably.

  Further, if the mutual separation angle θS of the two locking claws 45 is reduced to less than 90 °, the separation portion 42a on the outer peripheral edge of the lid body 41 away from the two locking claws 45 may be pulled up greatly. This can lead to a situation where the lid 40 can be easily opened.

  That is, when the separation part 42a on the outer peripheral edge of the lid 40 away from the two locking claws 45 is lifted, the receiving of the locking protrusion 25 on the lower surface of the outer peripheral edge of the lid 40 on the side close to the two locking claws 45 is performed. The proximity portion 42b that abuts the surface 29 serves as the center of rotation at the time of tilting, and the tilt angle θC of the lid 40 to be lifted is such that the flange portion 47 of the locking claw 45 abuts the lower surface 30 of the locking protrusion 25. The angle until it is regulated. At that time, if the gap H between the flange 47 of the locking claw 45 and the locking protrusion 25 when the lid 40 is mounted is the same, the separation angle θS of the two locking claws 45 is 90 °. Compared to the case described above, when the separation angle θS of the two locking claws 45 is less than 90 °, the distance from the rotation center (proximal part) 42b of the inclination of the lid 40 to the two locking claws 45 is as follows. The separation portion 42a on the outer peripheral edge side of the lid 40 that is shorter and away from the two locking claws 45 is lifted up greatly, and the inclination angle θC of the lid 40 is increased, so that the lid 40 can be removed without shifting laterally. This is because there is a possibility that it may be generated, leading to a situation where it is inadvertently disconnected, which is not preferable.

  In particular, in the embodiment, when the two locking claws 45 have a mutual separation angle in the range of 90 to 140 ° with respect to the center of the lid, the action of the pressing force on the upper side of the lid after mounting. When the inclination angle of the lid at the time is 4 ° within the range of 1 to 15 °, the lid 40 is opened so as to allow air A and rainwater W to escape accurately when the pressure in the vertical pipe portion 20 rises, and it is inadvertent The lid 40 can be prevented from coming off.

  That is, if the lid 40 is tilted so as to exceed 15 °, the tilt angle θC of the lid 40 increases, and there is a possibility that the lid 40 can be removed without shifting in the lateral direction.

  Further, even if the lid 40 can be attached to or detached from the opening 23 while being displaced substantially along the opening surface OP of the opening 23, the allowable inclination angle θC of the lid 40 is less than 1 °. This is because, when the internal pressure in the vertical pipe portion 20 after mounting is increased, the escape amount of the air A and the rainwater W cannot be secured sufficiently, and there is a possibility that pressure is applied to the indoor side, which is not preferable.

  Furthermore, in the mounting structure of the embodiment, the lid 40 is made of cast iron. Therefore, since the lid 40 is heavy, even if rain water W accumulates around the vertical pipe portion 20, there is no possibility that the lid 40 is inadvertently washed away from the lightweight synthetic resin lid.

  Moreover, as shown in FIG. 14, the synthetic resin lid 71 becomes brittle and breaks if exposed to the outdoors for a long time, but if the lid 40 is made of cast iron, There is no risk of damage.

  Further, in the mounting structure of the embodiment, the reinforcing rib 50 is protruded from the back surface of the lid main body 41. Therefore, the bending rigidity of the lid 40 is increased, and even if a heavy object is placed, the lid 40 can be prevented from being broken or bent.

  In the embodiment, the case where the reinforcing ribs 50 are arranged in a cross shape is shown. However, if the bending rigidity can be improved, a lattice shape, a plurality of concentric rings, or three or more directions extend from the center C. Reinforcing ribs may be provided as various shapes such as radial shapes.

  Moreover, in embodiment, although the attachment structure of the lid | cover 40 to the opening part 23 of the drainage basin 10 was demonstrated, in addition, for example, in the attachment structure of the lid | cover to the opening part in the manhole of about 300-350phi small diameter The present invention may be applied.

  Furthermore, in the embodiment, when the lid 40 is attached to the opening 23, the seal 28 is used to secure the sealing property and the opening 23 is closed. As the lid attached to the opening, for example, a lid in which a large number of holes penetrating vertically are formed, for example, a lid body formed in a lattice shape may be used.

10, 60, 70 ... Drainage, 20 ... (Mass frame) Vertical pipe part, 23 ... Opening part, 24 ... Recess, 25 ... Locking ridge part, 29 ... Receiving surface, 30 ... Lower surface, 40 ... Lid, 41 ... lid body, 42 ... support surface, 45 ... locking claw, 46 ... shaft part, 47 ... collar part, 50 ... reinforcing rib, 60/70 ... (conventional) drain, 61/71 ... (conventional) lid,
OC ... center of (opening), OP ... opening surface of (opening), CC ... center of (opening),
RP: Locking position (of the locking claw), θS: Separation angle, θC: Inclination angle.

Claims (5)

A mounting structure of a substantially disc-shaped lid that is attached to the drain of a drain or a manhole,
The opening is disposed on the inner peripheral side of the upper end of the substantially cylindrical vertical tube portion,
The inner surface of the upper end of the vertical pipe portion has an upper surface as a receiving surface capable of receiving the lower surface of the outer peripheral edge of the lid, and a concave portion capable of storing the lid is provided above the receiving surface and protrudes inward. The locking protrusion is disposed over substantially the entire circumference,
The lid is provided with a support surface supported by the receiving surface of the locking ridge on the lower surface of the outer peripheral edge of the lid body, and the locking of the lid so as to be able to be regulated upward. Two locking claws for locking the lower surface of the ridge portion are arranged on the lower surface in the vicinity of the outer peripheral edge of the lid body,
The two locking claws are respectively bent from the lower end of the shaft portion and extended outwardly so that the shaft portion extending downward from the lid body and the lower surface of the locking protrusion can be locked. And further comprising:
When the lid is attached to the opening, the lid is lowered from the position displaced from the center of the opening, along the opening surface of the opening, while being displaced and moved downward. The locking protrusions that are capable of locking the locking ridges by positioning the hooks of the locking claws below the locking ridges through the inner peripheral side of the locking ridges. Placed at the locking position below the lower surface of the strip, so that it can be attached to the opening,
The two locking claws are
The mutual separation angle with respect to the center of the lid is disposed as an angle of less than 180 °, and
During the action of the pressing force above the lid after mounting, while maintaining the locking of the locking ridge and restricting the lid from coming off from the opening, while tilting the lid, An attachment structure for a lid, wherein the lid is disposed so that an outer peripheral edge of the lid apart from the two engaging claws is separated upward from the receiving surface.   The lid mounting structure according to claim 1, wherein the two locking claws are disposed with a mutual separation angle within a range of 90 to 140 ° with respect to a center of the lid. . The two locking claws are
The mutual separation angle with respect to the center of the lid is in the range of 90 to 140 °, and
To make the inclination angle of the lid within the range of 1 to 15 ° at the time of the action of the pressing force above the lid after mounting,
The lid mounting structure according to claim 1, wherein the lid mounting structure is provided.   The lid mounting structure according to any one of claims 1 to 3, wherein the lid is made of cast iron.   The lid mounting structure according to any one of claims 1 to 4, wherein a reinforcing rib protrudes from the back surface of the lid body.

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